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(No Model.)

B. J. ARMSTRONG.

GROSS HEAD FORSTEAM ENGINES. No. 372,102. PatentedOot. 25, 1887.

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1 UNIT D STATE PATENT OFFI E,

EDWIN J. ARMSTRONG, OF PAINTED POST, NEW YORK, ASSIGNOB TO THE WESTON ENGINE COMPANY, OF SAME PLACE.

C ROSS=HEAD FOR STEAM-ENGINES.

SPECIFICATION forming-part of Letters Patent No. 372,102, dated October 25, 1887.

Application filed April 30, 1887. Serial No. 236,683. (No model.)

To ctZZ whom, itmag concern.-

Be it known that I, EDWIN J. ARMSTRONG, a citizen of the United States, residing at V Painted Post,.in the county of Steuben and 5 State of New York, have invented certain new and useful Improvements in OrossHeads for Steam-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enableoth: Io ers skilled in the art to which it appertains to make and use the same.

This invention relates to crossheads for steam-engines; and it has for its object to provide very large bearings with the minimum of 5 weight, and also to provide effective means for clamping the piston-rod and cross-head pin in their respective positions; and it consists of the parts and'combinations ofparts hereinafter described and claimed.

In the accompanying drawings, forming a part of this specification, Figure l is a side elevation of my improved cross-head; Fig. -2,

. an end elevation, and Fig. 3 a plan view.

Similar letters refer to si milar parts th roughout the several views.

A represents the bed of the engine, having a trough-shaped bearing formed therein to receive the slide 13 of the cross-head. The slide 13 is of rectangular form, and has flanges a 0 formed on each side thereof, from which pr0- ject inwardly perforated and screw-threaded lugs 11, into which screw-bolts 0 enter to secure the cross-head O to the slide, the cross-head resting on the upper surface of said lugs. The

. slide is slightly wider than the cross-head, and

its upper surface forms a ledge on either side,

on which gibs e, which are bolted to the bed of the engine, rest to hold said slide down. The slide is also concaved or hollowed out about its middle between the lugs on each side, to receive the rounded portion at of the cross head 0. This crosshead is composed of two similar castings, as clearly shown, each of which is formed with a semi-cylindrical recess 5- on each side, which,-when the castings are brought together, form a cylindrical recess, in which is fitted the hollow pin D. This pin,

as indicated by dotted lines in Fig. 3, is reduced at both ends, so as to fit thecylindrical 5o recess in the cross-head, and has a flange, h,

cast therewith, which ,fits in a corresponding recess formed in the outer ends of the large cylindrical recess formed in the casting, so as to retain the pin rigidly in the position to which it is clamped. This object is also further secured by the ends of that portion of the pin which bear against the inner sides of the cross-head arms.

In the end of the eross-head which receives the piston-rod H a semi-cylindrical opening is formed in each casting and screw-threaded, so that when brought together they form a screwthreaded perforation, in which the end of the piston-rod H is screwed. The castings are held together and to the slide by the screwbolts 0, as above explained, and the piston screwed into the perforation, the castings not being so solidly bolted together as to prevent this; but after the rod is inposition two screw bolts, m, are passed through the end of the cross-head on each side of the piston-rod, to firmly draw or bolt the parts together, and thus clamp the rod rigidly in place.

It will beunderstood that upon the loosening of the bolts 0 m the pin may be turned partly around to present a new surface for Wear, and thus equalize the wear'on all parts thereof, and the piston-rod may likewise be adjusted in the direction of its length to we serve the proper amount of clearance at each end of the cylinder. Thus it will be seen that I provide a cross-head having large bearings, and as the parts are all interchange able, they may be easily replaced by others when broken or worn out, and also, owing to my peculiar construction of the cross-head in parts, a hollow pin having bearing on both sides of the arms "of the cross-head and re duced at its ends, that the cross-head will be very light for its size, and will be prevented from springing, as would be the case if made light and without the reduced ends ofthe pins to support it on each side.

Having thus described my invention, what I claim as new, and desire to secure by Letters 5 Patent, is-

l. A cross-head for steamengines, comprising the following parts: a slide wider than the cross-head and havingconcaved or'hollowedout sides andlfianges having screw-threaded ICQ perforated projections thereon, a cross-head formed of two similar castings having semioylindrical recesses formed in each casting at their sides and screw-threaded concavities in 5 the end of the same, and a hollow pin having reduced ends provided with flanges and having a bearing on both sides of the cross-head,

and screw-bolts for clamping the casting together and to the slide, as set forth.

In 2. The combination, in a cross-head of an engine, composed of two similar castings clamped together, of a hollow pin having a. bearing on both sides of said cross-head and a slide rigidly secured to said cross-head, substantially as described. 1

In testimony whereof I affix my signature in presence of two Witnesses.

ED\VIN J. ARMSTRONG.

\Vitnesses:

PHILIP 1\IAURO, G. J. HEDRICK. 

